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Java client for Arcus memcached
There is a newer version: 1.14.0
/*
 * arcus-java-client : Arcus Java client
 * Copyright 2010-2014 NAVER Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.spy.memcached.protocol.ascii;

import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.Collections;

import net.spy.memcached.KeyUtil;
import net.spy.memcached.collection.CollectionResponse;
import net.spy.memcached.collection.CollectionStore;
import net.spy.memcached.ops.CollectionOperationStatus;
import net.spy.memcached.ops.CollectionStoreOperation;
import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationState;
import net.spy.memcached.ops.OperationStatus;

/**
 * Operation to store collection data in a memcached server.
 */
public class CollectionStoreOperationImpl extends OperationImpl
	implements CollectionStoreOperation {

	private static final int OVERHEAD = 32;

	private static final OperationStatus STORE_CANCELED = new CollectionOperationStatus(
			false, "collection canceled", CollectionResponse.CANCELED);
	
	private static final OperationStatus CREATED_STORED = new CollectionOperationStatus(
			true, "CREATED_STORED", CollectionResponse.CREATED_STORED);
	private static final OperationStatus STORED = new CollectionOperationStatus(
			true, "STORED", CollectionResponse.STORED);
	private static final OperationStatus NOT_FOUND = new CollectionOperationStatus(
			false, "NOT_FOUND", CollectionResponse.NOT_FOUND);
	private static final OperationStatus ELEMENT_EXISTS = new CollectionOperationStatus(
			false, "ELEMENT_EXISTS", CollectionResponse.ELEMENT_EXISTS);
	private static final OperationStatus OVERFLOWED = new CollectionOperationStatus(
			false, "OVERFLOWED", CollectionResponse.OVERFLOWED);
	private static final OperationStatus OUT_OF_RANGE = new CollectionOperationStatus(
			false, "OUT_OF_RANGE", CollectionResponse.OUT_OF_RANGE);
	private static final OperationStatus TYPE_MISMATCH = new CollectionOperationStatus(
			false, "TYPE_MISMATCH", CollectionResponse.TYPE_MISMATCH);
	private static final OperationStatus BKEY_MISMATCH = new CollectionOperationStatus(
			false, "BKEY_MISMATCH", CollectionResponse.BKEY_MISMATCH);
	private static final OperationStatus LENGTH_MISMATCH = new CollectionOperationStatus(
			false, "LENGTH_MISMATCH", CollectionResponse.LENGTH_MISMATCH);
	
	protected final String key;
	protected final String subkey;	// e.g.) 0 or 0x00
	protected final CollectionStore collectionStore;
	protected final byte[] data;
	
	public CollectionStoreOperationImpl(String key, String subkey,
			CollectionStore collectionStore, byte[] data, OperationCallback cb) {
		super(cb);
		this.key = key;
		this.subkey = subkey;
		this.collectionStore = collectionStore;
		this.data = data;
	}

	@Override
	public void handleLine(String line) {
		assert getState() == OperationState.READING
			: "Read ``" + line + "'' when in " + getState() + " state";
		getCallback().receivedStatus(
				matchStatus(line, STORED, CREATED_STORED, NOT_FOUND, ELEMENT_EXISTS,
						OVERFLOWED, OUT_OF_RANGE, TYPE_MISMATCH, LENGTH_MISMATCH, BKEY_MISMATCH));
		transitionState(OperationState.COMPLETE);
	}

	@Override
	public void initialize() {
		String args = collectionStore.stringify();
		ByteBuffer bb = ByteBuffer.allocate(data.length
				+ KeyUtil.getKeyBytes(key).length
				+ KeyUtil.getKeyBytes(subkey).length
				+ KeyUtil.getKeyBytes(collectionStore.getElementFlagByHex()).length
				+ args.length()
				+ OVERHEAD);
		setArguments(bb, collectionStore.getCommand(), key, subkey,
				collectionStore.getElementFlagByHex(), data.length, args);
		bb.put(data);
		bb.put(CRLF);
		bb.flip();
		setBuffer(bb);
		
		if (getLogger().isDebugEnabled()) {
			getLogger().debug("Request in ascii protocol: " 
					+ (new String(bb.array())).replace("\r\n", "\\r\\n"));
		}
	}

	@Override
	protected void wasCancelled() {
		getCallback().receivedStatus(STORE_CANCELED);
	}
	
	public Collection getKeys() {
		return Collections.singleton(key);
	}
	
	public String getSubKey() {
		return subkey;
	}

	public CollectionStore getStore() {
		return collectionStore;
	}

	public byte[] getData() {
		return data;
	}
	
}